Fungicide



Patented Dec. 25, 1934 UNITED STATES PATENT OFFICE FUNGICIDE No Drawing.

10 Claims.

This invention relates to fungicides and more particularly to thepreservation of wood and other materials against attack from fungi andthe like.

It is well known that wood and other materials such as cellulose fabricsand similar materials are subject to attack from various fungi which rotor discolor the materials and render "them unfit for various uses.Accordingly, it has been proposed to treat such materials with various,substances for the purpose of protecting them against attack from suchfungi but these substances have generally proved to be unsatisfactory.

An object of the present invention is to protect wood and othermaterials such as cellulose fabrics and the like against attack fromvarious fungi. A further object is to treat such materials with asubstance which is toxic to fungi and is more satisfactory and eflicientthan other substances heretofore employed for this purpose. A stillfurther object is to provide, as new articles of manuf acture, materialswhich have been rendered more resistant to the attack of fungi. Stillother and further objects are to provide a new composition of matter andto advance the art. Other objects will appear hereinafter.

These objects may be accomplished according to our invention whichcomprises impregnating wood or the-other materials above mentioned witha-nitro-naphthalene. We have found that anitro-naphthalene is toxic tovarious blue stain and other cellulose destroying fungi, such as Fomesannosus, Graphium rigidium, Poria incrassata, Lenzites trabea,Ceratostomella pluriannulata, and Ceratostomella pilifem. As comparedwith this compound, such compounds as 2 5-dinitro-naphthalene,tri-nitro-naphthalene, and tetra-nitro-naphthalene appear to berelatively non-toxic.

In order to illustrate the effect of this compound on various fungi, thefollowing examples are given:

Example 1.-One part of a-nitro-naphthalene in 500 parts of rice cultureeffectively prevents the growth of Ceratostomella pilifera and Fomesannosus.

Example 2.-0ne part of a-nitro-naphthalene in 2000 parts of rice cultureeffectively prevents the growth of Lenzites trabea and Poria incrassata.

Example 3.In order to test'the bactericidal properties of this compound1 part of it was incorporated in 1000 parts of nutrient agar culture butdid not inhibit the growth of B-coli. Accordingly this compound does notappear to be an emcient bactericide.

Application June 23, 1932, Serial No. 618,936

In carrying out our invention we prefer to treat partially or whollydried wood with an impregnating solution comprising a 5% solution ofanitro-naphthalene in kerosene, benzene, o-dichlor-benzene or naphtha orany combination of two or more of these solvents. Our invention,however, is not to be limited to the use of these particular solvents asmany other suitable solvents may be substituted therefor, 01 thecompound may be employed in a molten, fluid or 10 emulsified state.After the pores of the wood have been partially 'or completely filledwith the impregnating material, the wood is removed from theimpregnating bath and the volatile constituent or constituents of theimpregnating material 15 are allowed to evaporate. 'If desired, theevaporation of the volatile constituents from the wood may be elfectedby the use. of diminished pressure or increased temperature or both.Wood treated in this manner will be found to be eifec- 2o tivelyprotected against the attacks of the various blue stain and other woodrot fungi.

Cellulose fabrics and other materials subject to decay or stain due toattack by fungi may also be impregnated with a-nitro-naphthalene andthus preserved against such infection.

While we have disclosed our compound as bemg employed in a certain.definite concentration in specific solvents, it will be readily apparentto those skilled in the art that the particular'solvent employed, theconcentration of the compound in the solvent and in general the methodof impregnating the wood with the compound may be greatly modifiedwithout departing from the spirit of our invention. Accordingly, thescope of cm invention is to be limited solely by the appended claimsconstrued as broadly as is permissible in view of the prior art.

We claim:

1. The method of preserving materials normally subject to attack byfungi which comprises im- I pregnating the materials witha-nitro-naphthalene. I

2. The method of preserving materials 1101'!" mally subject to attack byfungi which comprises treating the materials with a solution ofa-nitr'onaphthalene.

3. The method of preserving materials normally subject to attack byfungi which comprises treating the materials with a volatile solventcontaining about 5% of a-nitro-naphthalene.

4. The method of preserving materials normally subject to attack byfungi which comprises treating the materials with a member ofthe groupconsisting of kerosene, benzene, o-dichlor-bena-nitro-naphthaand thelike which comprises treating the wood with a solution ofa-nitro-naphthalene.

8. The method of protecting wood from fungi harbor, Ohio. filed January9, 1937,

Nemours and Company,

Hereby enter this disclaimer to that claims 1, 2, 6; and 7 thereof whichis in w l. The method of preserving materialsnormall DISCLAIMER1,985,597.W'ill'iam 5. 0mm, Pennsgro've, N. l, and

ords as follows, to-wit':-

and the like which comprises treating the wood with a volatile solventcontaining about 5% of a-nitroV-naphthalene.

- 9. The method of protecting wood from fungi or the like whichcomprises treating the wood with a member of the group consisting ofkerosene, benzene, o-dichlor-benzene, and naphtha containinga-nitro-naphthalene.

'10; The method of protecting wood from fungi or the like whichcomprises treating the wood witha member of the group consisting ofkerosene', benzene, o-dichlor-benzene, and naphtha containing about 5%a-nitro-naphthalene.

WILLIAM S. CALCOTI. MELVIN 0. FOREMAN.

Melvin 0. 'Qiik- .FUNGICIDE. Patent dated December 25, 1934. Disclaimerby the patentees; theassignee, E. I. do de assentmg and concurring.

part of the specificatiom. particularly subject to attack by fungi whichcomprises impregnating the materials with a so ution ofa-nitro-naphthalene.

2. The method of preserving materials normally which comprises treating6. The method of -1mpregnatmg the wood I 7. The method ofthiemtglterials a solution of pro 0 g woo rom fun andthe lik with amtro-naphthalene. g1 e w eh com-P protecting wood from fungi and thelike which comprisessubject to attack by"; fungi a-n tro-na hthalene.

treating the wood with a solution of a-nitro-naphthalenef I [QfieialGazette Febmary 9, 1.937.

a-nitro-naphthaand the like which comprises treating the wood with asolution of a-nitro-naphthalene.

8. The method of protecting wood from fungi harbor, Ohio. filed January9, 1937,

Nemours and Company,

Hereby enter this disclaimer to that claims 1, 2, 6; and 7 thereof whichis in w l. The method of preserving materialsnormall DISCLAIMER1,985,597.W'ill'iam 5. 0mm, Pennsgro've, N. l, and

ords as follows, to-wit':-

and the like which comprises treating the wood with a volatile solventcontaining about 5% of a-nitroV-naphthalene.

- 9. The method of protecting wood from fungi or the like whichcomprises treating the wood with a member of the group consisting ofkerosene, benzene, o-dichlor-benzene, and naphtha containinga-nitro-naphthalene.

'10; The method of protecting wood from fungi or the like whichcomprises treating the wood witha member of the group consisting ofkerosene', benzene, o-dichlor-benzene, and naphtha containing about 5%a-nitro-naphthalene.

WILLIAM S. CALCOTI. MELVIN 0. FOREMAN.

Melvin 0. 'Qiik- .FUNGICIDE. Patent dated December 25, 1934. Disclaimerby the patentees; theassignee, E. I. do de assentmg and concurring.

part of the specificatiom. particularly subject to attack by fungi whichcomprises impregnating the materials with a so ution ofa-nitro-naphthalene.

2. The method of preserving materials normally which comprises treating6. The method of -1mpregnatmg the wood I 7. The method ofthiemtglterials a solution of pro 0 g woo rom fun andthe lik with amtro-naphthalene. g1 e w eh com-P protecting wood from fungi and thelike which comprisessubject to attack by"; fungi a-n tro-na hthalene.

treating the wood with a solution of a-nitro-naphthalenef I [QfieialGazette Febmary 9, 1.937.

